Electrical switch



Nov. 3 1925- 1,560,177"

A. LINARD ELECTRI CAL SWITCH Filed Jan. 1 1925 Z a f? 3% m 3 Patented Nov. 3, 1925.

UNITED STA rss PATEN OFFICE.

ALEXANDER LINARD, or MIDDLE BRIGHTON, NEAR. MELBOURNE, VICTORIA, AUSTRALIA.

ELECTRICAL swr'rcir.

Application filed January 18, 1923. Serial No. 613,485.

To all whom it may concern: Be it known that ALEXANDER LINARD, a

' citizen of the Commonwealth of Australia,

vention consist firstly for cooling the same.

' mgs in which: 7

Figure 1 is a view in side elevation with and resident of 42 SussexvStreet, Middle Brighton,,11ear--Melbo'urne,in the State of Victoria, Commonwealth of Australia, has invented a certain new and useful Improved Electrical Switch, of which the following is a specification. ,I

This invention relates to an improved electrical switch and has been devised in order to provide a cheap simple and effective switch whereby the light may be dimmed to the smallest degree or gradually strengthened to its greatest intensity. The essential features embodied in this inin functioning the switch arm so that it moves over the surface of the resistance winding'and'dire'ctly -inl-contact therewith from the peak of the current to zero and vvice versa as desired so that when starting from the peak the light gradually dims and when starting from zero the light gradually strengthens, the arrangement being such that as the switch contact moves from the peak of the current, each Winding of the resistance wire causes a decrease in light intensity. v

Secondly the formation in the block upon which the wire is wound of one, two or more holes lengthwise of the block and winding to allow air circulation through In order that the invention may be more readily understood it will now be described with reference to the acco panying drawthe cover ,in section.

a?" Figure 2 is a vertical central section of Figure 1. Y r

Figure 3 is a-view injplan of Figure 1 with the cover removed.

' Figure 4'is a view in vertical central section of the block upon which the resistance is wound and its base Figure his a view in plan of the wind- .ing illustrating by dotted lines the are or travel of the switch contact over the surface of the winding, and 4 Figure 6 is a .view in plan of an essential deta. According" to this invention a base member a is provided preferably circular in shape 1 and recessed atb to rece ve the block 0 upon the winding which the resistance wire (I is wound, the

block being formed with lugs e by means of which it is fastened to the base a by the fastening bolts f.

The resistance 03 is wound from the peak side 9 of the block 0 and is coupled through the hole It to the terminal it lead 71F. a

v The screw 21 connects the other head 2' and communicates with the conductorarm j pass ing upwardly as at j and then horizontally above the winding d as at j Held to this arm j by the screw 7' and sleevej" is a switch arm 3' the outer end of which on the-underside is provided with a roller or other contact 7' which is adapted to IIIOXB in thepath y" over'the surface of the windingdshown by dotted lines in F igures 3 and 5 The radial movement of the arm 9' is limited by the stops 7' projecting from the end of the arm 7' and such radial movement is caused by switch plug or finger piece it, countersunk to receive the nut k and pressing on the sleeve 9' in direct contact with the switch arm 1' the head is of the screw 7' being below the arm j so that when the parts are in position the operation of the switch plug or finger piece 1: causes the arm 7' to swing radially over the surface of the windmg.

The winding at the zero side at the end the dead end which with lead. v

In 'order to cool the winding an air hole or holes n ort any'suitable shape may be formed in the block 0 so that air can circulate through the block and between the windings thereon.

A cover 12 is provided suitably perforated such as at pto allow of air circulation, and this cover is detachably; connected to the base a in any convenient way, preferably by forming oppositely disposed knobs p on the base a which are received formedpn the cover. I I

In operation the turning of the switch plug k moves the roller 3' on switch arm 7' over the surface of the winding d and when starting from the the movement the does not communicate dimmer the light until it reaches the'zero side Z of the winding.-

On the opposite movement the light is gradually strengthened as the roller 7'' moves peak side g the further connecting the opposite to the peak side 9 is terminated at I in recesses p towards the peak and as the number of windings d are, cut out of the circuit.

. I desire it to be understood that various lmproveinents and modifications may be emconductor arm for operating the contact arm, and a perforated covering casing fixed to the base.

' I 3. A device as described, comprising, a

bodied without depart'ng from the spifilt and scope of the invention, the essential: feaat'ing knob carried by the upper end of the to secure by Letters Patent is I 10 7 --comprising, a base, a perforated block onthe and leading to a point above the winding, a

contact arm pivoted to the-conductor arm',

base, a block having a' resistance winding wound thereon, the block being formed with holes to allow of the circulation of air beand a'rolleron the contact arm in contact with the u per surface of the windings.

2. A devlce according to claim 1, an. opertween the windin s, a fixed conductor arm leading from the ase to a point above the a winding, a swinging contact arm in electricalcontact with the conductor arm, a finger piece for operating the contact arm, and a roller contact on the contact arm positioned 1 to move in contact with the winding over the upper surface thereof.

' Signed 1 at Melbourne, Victoria, Australia, this 2nd day of November 1922.

ALEXA DER'LINARD. 

